| ??? 03/11/05 13:36 Read: times |
#89450 - About Serial Communication!!!!!Help |
Remark: the MCU is P89C51RD2, which is 6 clock per machine cycle
I want to write program in 89C51 for sending data to a PC by using serial communication Timer 0 for counting something, Timer 1 for serial commuication, when i set the th1/tl1 to 0fah (6 clock per machine cycle, so use 0fah), and pcon to 0, the system using 9600 baud rate, and it can send correct data to the PC, but when i change th1/tl1 to 0fdh to double the baud rate, the system using 19200, but the data received in PC is totally wrong, does anybody guess what may be the problem, thanks My code: mov psw,#00h mov tmod,#00100110b ;counter0 mode2 mov th0,#(256-COUNT) mov tl0,#(256-COUNT) mov th1,#0fah ;baud rate (fd=19200,fa=9600) mov tl1,#0fah ;TH1=TL1 = 256 - (freq / (32 * 12 * BAUD)) mov pcon,#00h mov scon,#50h ;8-bit UART mode1 (Serial Mode 1 Set by Timer 1) setb tr1 ;run timer1 setb es clr tf0 ;clear interrupt flat setb tr0 ;enable timer0 setb et0 ;enable timer0 interrupt |
| Topic | Author | Date |
| About Serial Communication!!!!!Help | 01/01/70 00:00 | |
| insufficient | 01/01/70 00:00 | |
| Sorry, the crystal is 11.0592MHz | 01/01/70 00:00 | |
| It's a miracle | 01/01/70 00:00 | |
| amazing | 01/01/70 00:00 | |
| Sorry, since the program is very large.. | 01/01/70 00:00 | |
| Large program | 01/01/70 00:00 | |
| Result | 01/01/70 00:00 | |
| do you believe | 01/01/70 00:00 | |
| MAX232C | 01/01/70 00:00 | |
| 19200??? | 01/01/70 00:00 | |
| PCON vs 6 clock | 01/01/70 00:00 | |
| P89C51RD2 6 clocks per machine cycle | 01/01/70 00:00 | |
| DESCRIPTION | 01/01/70 00:00 | |
| Here we go again | 01/01/70 00:00 | |
Re:amazing | 01/01/70 00:00 | |
| H or not | 01/01/70 00:00 | |
| The chip is P89C51RD2 | 01/01/70 00:00 | |
| insufficient | 01/01/70 00:00 | |
| I am not sure about that... | 01/01/70 00:00 | |
| the 'H' is important | 01/01/70 00:00 | |
| is P89C51RD2HBP | 01/01/70 00:00 | |
| Solved | 01/01/70 00:00 | |
| 0xFF ??? | 01/01/70 00:00 |